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iS IT necessary to use cookies when you want to
save information in a form textfield and be able to click back to that page and the information is still there before submitting it.Sometimes it seems to stay sometimes not ?

It depends

It's hard to say what the best solution for your problem is. But you have three possible ways to go about it (at least three that I can think of).

1.) make the user re-enter the data whenever they return.
2.) use a cookie to store the form data and populate the fields when the user returns(not recomended).
3.) Use a database or text file to store the field variables and relate it back to the user with a login or id stored in a cookie.